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Installation and Operating Manual for RPI M15A M20A Solar Inverter V1.0 2016-03-18
6 Planning the installation
6.9 Connecting to a data logger
The inverter can be connected to a data logger via RS485, for
example to monitor the PV installation or to change the settings
on the inverter.
Several inverters can be connected in series to a data logger.
The following recommendations must be taken into consideration
for a stable data link.
Connecting a single inverter to a data logger
► Switch on the RS485 termination resistor.
► Run the RS485 cable at a distance from the other cables to
prevent interference to the data link.
Connecting several inverters to a data logger
► Switch on the RS485 termination resistor on the last inverter
in the chain.
► If the data logger has no internal RS485 termination resis-
tor, then switch on the RS485 termination resistor on the first
inverter in the chain as well.
► Switch off the RS485 termination resistor on all the other
inverters.
► A different inverter ID must be set on each inverter. Other-
wise the data logger will not be able to identify the individual
inverters.
► Set the same baud rate for RS485 on each inverter.
► Run the RS485 cable at a distance from the other cables to
prevent interference to the data link.
Requirements for the cables
● Twisted and shielded cable
● Cable diameter: 5 mm
● Wire cross-section: 1 mm
2
6.10 Dry contacts
An external audible or visual alarm device can be connected to
the dry contacts on the inverter.
COM N01
Fig. 6.20: Pin assignment of the dry contacts
If the fans fail,
COM
and
N01
will be closed.
Requirements for the cables
● Twisted and shielded cables (CAT5 or CAT6) with 2 cores
● Cable diameter: 5 mm
● Wire cross-section: 1 mm
2
6.11 Connecting a ripple control receiver
Please contact Delta customer service if you want to connect a
ripple control receiver. You will find the contact data on the last
page of this document.
6.12 Using an external grid and system pro-
tection device
For PV installations larger than 30 kVA, the German standard
VDE-AR-N 4105, Section 6.1 requires the use of an external grid
and installation protection device with section switch.
Alternatively, VDE-AR-N 4105, Section 6.4.1 allows the use of an
inverter with an internal section switch if the switch disconnects
the inverter from the grid in less than 100 ms.
This inverter meets the requirements of VDE-AR-N 4105, Section
6.4.1 if the following firmware is installed: DSP ≥ 2.20 / COMM
≥ 2.32. In this case, no external grid and installation protection
device is needed.
